Purpose: This study aimed to investigate the influence of health beliefs, knowledge, and vaccination intentions on pertussis immunization among pregnant women. Methods: The study included a total of 136 pregnant women who visited four obstetrics and gynecology centers in City G. Data were collected between June 15 and July 15, 2023, using structured questionnaires. Hierarchical logistic regression analysis was performed using SPSS/WIN 26.0. Results: Analysis of the factors influencing pertussis vaccination in pregnant women at beyond 20 weeks of gestation identified gestational age, exposure to pertussis vaccine-related information, perceived severity of health beliefs, knowledge, and vaccination intentions was significant predictors. Notably, pregnant women at exceeding 27 weeks of gestation demonstrated a significantly higher probability of pertussis vaccine acceptance than those in the earlier stages of pregnancy. Conclusion: Assess to pertussis-related information is associated with a higher propensity for vaccination among pregnant women. Additionally, heightened perceptions of disease severity and enhanced knowledge about pertussis were positively correlated with both vaccination intention and uptake rates.